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There's Enough! 15 Things About Machine Espresso We're Sick Of Hearing
How Does Machine Espresso Work?

The machine espresso utilizes precise pressure and filtering system that is awe-inspiring to create the coffee you enjoy. How exactly does it work?

Espresso is produced by pushing hot water under high pressure through finely-ground coffee. The process is similar to that of making drip coffee. However the pressure is the main difference.

The Head of the Group

The group head is the portafilter that you place in the espresso maker when making it. It disperses water in the portafilter and regulates the pressure of the extraction. There are a variety of group heads each with distinct advantages and disadvantages. Some are specifically designed for temperature stability while others are specifically designed to handle pre-infusion. Some are designed to control the lever. Some have a combination, such as the E61. This is a very popular choice for baristas due to the fact that it has multiple advantages in one package.

As you can see from the above photo the head of the group is equipped with several notches. You place your portafilter inside these notches, and then turn the head around to secure it. There is also a rubber gasket in the notches to help create the seal when you insert your portafilter into the machine. home espresso machine on the head allow for a precise position of the portafilter which is vital to ensure an even extraction.

The group head is not just able to allow you to place your portafilter easily however it also keeps the same temperature. It does this by circulating hot water through the brew pan and around the portafilter, ensuring that it's always at the correct temperature for extraction. This is crucial, since just a few degrees could make the difference between good and great espresso.

The Pump

In contrast to piston machines that are manually operated, that use a lever to pressurize water, rotary espresso machines rely on motorized pumps to provide the nine atmospheric bars of pressure necessary to extract espresso. The pressure builds up by drawing tap water from a reservoir, and pumping it through a heat exchanger prior to being pumped through the ground coffee inside the group head.

Pumps are typically less expensive than piston-driven machines and tend to last longer. However, both types of machines can become damaged due to excessive use and poor cleaning. Pumps are also more complex mechanically, which can raise prices of even simple models.

Certain espresso machines utilize steam pressure instead of a pump in order to brew espresso. This can cause over-extraction because the boiler that makes steam also warms the water to boil. They also have to continually rebuild their pressure between cups. This requires energy and time.

A majority of espresso machines use either a rotary or vibration pump, which is a vibration model that uses a vibrating disc to create the pressure and an rotary model that pushes hot water through the grounds under high speed. Both types of machines can make a great espresso, but the rotary pumps are quieter, and more durable than vibration pumps.

The Boiler

The boiler is the component that heats water to the optimal temperature to extract. The steam that is produced reaches the portafilter that contains the ground espresso coffee, and gets funnelled down into the cup. During this process, the steam causes pressure to push through the grounds of the coffee. This results in a layer of crema that is then poured over. This is one of the hallmarks of a good espresso.

There are three kinds of espresso makers. They differ in the type of pump they employ and the degree of heat that the espresso is. There are many ways to control the strength of the brew and the size of the cup that can be produced by the machine.

The earliest espresso machines were steam type. The earliest espresso machines were steam types. This led to the coffee tasting bitter and burnt. The modern espresso machine was developed by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most commonly used espresso maker is a semiautomatic machine with an electric pump. These are the things people think of when they think of an espresso maker. Semi-automatic machines require you to grind and tamp the beans yourself while the pump controls the flow of water and pressure. This is an excellent compromise between human touch and the mechanized quality.

The Filter

Typically, espresso machines utilize filters to separate the grounds of coffee when they pass through the hot water. The filter is also a vital element of the machine's temperature control, as it helps prevent overheating.

Filters also aid in flavor as it allows for a longer flowering phase. This lets the beans release their flavors, and allows for a better extraction.


However it is crucial to keep in mind that even a great filter could result in a bad cup of coffee, as the quality of the beans and extraction are crucial.

It's here that the magic happens. This is the reason why espresso tastes so good. The grouphead (also called the brewhead) is where you put the portafilter, the thingy which you put the grounds of your coffee into when making espresso.

In an espresso machine that is driven by steam, hot water is heated in an airtight container to produce steam, which is then pushed through the grounds with high pressure. These machines are cheaper and are easier for the user to maintain than pumps-driven models. However, they are not as efficient in their ability to create the ideal conditions for brewing as they only operate at 1-1.5 bars of pressure. The perfect shot requires 9-10 bars.

In recent years, espresso machines powered by compressed air-pump have become increasingly popular. They use an air-compressor to push hot water through the ground and are more mobile than steam-driven electric espresso machines.

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